Add logged in user as default creator in submission form

[J4bbi]

• Issue: Add depositing user as Creator #73

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This PR introduces an utility function for the settings module that formats user profile information to
become a creator default value in the submission form.

It presupposes that a user will always be a person, and not an organisation.

Developer Checklist

Developers should review and confirm each of these items before requesting review

• Code meets acceptance criteria from issue
• Unit tests are written and all pass
• User Test Scripts (if required) are written and have been run through
• Code documentation and related non-code documentation has all been updated

Reviewer Checklist

Reviewers should review and confirm each of these items before approval
If there are multiple reviewers, this section can be duplicated for each reviewer

• Code meets acceptance criteria from issue
• Unit tests are written and all pass
• User Test Scripts (if required) are written and have been run through
• Code documentation and related non-code documentation has all been updated
• Migation has been created and tested

Testing

List user test scripts that need to be run

List any non-unit test scripts that need to be run

[cc-a]

Looks great. Just a couple of minor tweaks suggested. Let's merge and open an issue to track a potential improvement down the line once we are better integrated with ICL data sources that would enable us to provide more comprehensive information.